I believe its A. I could be incorrect though.
Ozone is the pollutant that forms when automobile emissions react with oxygen gas and ultraviolet light.
Answer:
If the Earth suddenly had no gravity, the Earth’s atmosphere would float into space. Everything not attached to the Earth would fly off into space. Things like trees and most buildings would remain because they are rooted. Since the Earth, itself, is held together by gravity, it would most probably break apart into chunks and float off.
Explanation: